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基于含硅类增稠剂的新型超临界CO2压裂液的流变特性及岩心伤害评价

许柳,  付美龙,  黄倩,  王杰,  赵众从

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文章导航 > 钻井液与完井液  > 2020 >  37(2): 250-256
许柳, 付美龙, 黄倩, 王杰, 赵众从. 基于含硅类增稠剂的新型超临界CO2压裂液的流变特性及岩心伤害评价[J]. 钻井液与完井液, 2020, 37(2): 250-256. doi: 10.3969/j.issn.1001-5620.2020.02.020
引用本文: 许柳, 付美龙, 黄倩, 王杰, 赵众从. 基于含硅类增稠剂的新型超临界CO2压裂液的流变特性及岩心伤害评价[J]. 钻井液与完井液, 2020, 37(2): 250-256. doi: 10.3969/j.issn.1001-5620.2020.02.020
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XU Liu, FU Meilong, HUANG Qian, WANG Jie, ZHAO Zhongcong. A New Supercritical CO2 Fracturing Fluid Containing Silicon Thickener: It's Rheological Property and Core Damage Evaluation[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(2): 250-256. doi: 10.3969/j.issn.1001-5620.2020.02.020
Citation: XU Liu, FU Meilong, HUANG Qian, WANG Jie, ZHAO Zhongcong. A New Supercritical CO2 Fracturing Fluid Containing Silicon Thickener: It's Rheological Property and Core Damage Evaluation[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(2): 250-256. doi: 10.3969/j.issn.1001-5620.2020.02.020
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基于含硅类增稠剂的新型超临界CO2压裂液的流变特性及岩心伤害评价

doi: 10.3969/j.issn.1001-5620.2020.02.020

  • 长江大学石油工程学院, 武汉 430100

基金项目: 

国家自然科学基金资助项目“超临界二氧化碳泡沫压裂液流变行为与摩阻特性研究”（51604036）

详细信息
    作者简介:

    许柳,长江大学石油与天然气工程专业在读研究生,研究方向为超临界CO2压裂液技术研究。电话18732936158;E-mail:920827113@qq.com

    通讯作者:

    付美龙,教授,1967年生,现从事油田化学及提高采收率技术的教研工作。电话13607210109

  • 中图分类号: TE357.12

A New Supercritical CO2 Fracturing Fluid Containing Silicon Thickener: It's Rheological Property and Core Damage Evaluation

  • School of Petroleum Engineering, Yangtze University, Wuhan, Hubei 430100

    摘要
  • 摘要: 针对超临界CO2压裂液黏度低、携砂能力差的应用现状合成了含硅类增稠剂，并研究了超临界CO2压裂液的流变特性及岩心伤害情况，旨在为增稠剂的优选以及现场压裂施工提供参考依据。通过溶液聚合法室内合成了聚甲基倍半硅氧烷PMSQ和聚甲基倍半硅氧烷-醋酸乙烯酯PMSQ-VAc二元共聚物增稠剂，采用红外光谱测试验证了增稠剂样品的主要官能团，运用高压长管管流实验法测试了超临界CO2压裂液的增黏效果及其流变特性，最后评价了超临界CO2压裂液在人造裂缝天然长岩心中的滤失性、岩心伤害率。研究结果表明，随着温度、压力的升高，2种增稠剂的增黏效果均先增大后减小；随着增稠剂注入量的增大，2种CO2压裂液的黏度先增大后减小；在超临界CO2流体中，PMSQ-VAc的增黏效果相对较好，可使其黏度最大达到3.892 mPa·s；在渗透率为0.551 mD的岩心中，PMSQ-VAc与超临界CO2流体混合后压裂液的滤失系数为1.435×10-2 m/min1/2，滤失速度为0.010 m/min，岩心的伤害率为16.33%~25.36%，滤失系数和滤失速度较小，伤害程度属弱。

     

    Abstract: A silicon thickener has been developed to deal with the problems that supercritical CO2 fracturing fluid is faced with, such as low viscosity and poor sand carrying capacity. The rheological properties and core damage of supercritical CO2 fracturing fluid were studied to provide a reference for the selection of thickeners and field fracturing operation. Two thickeners have been developed through solution polymerization; one is polymethylsilsesquioxane (PMSQ) and the other, a copolymer of polymethylsilsesquioxane and vinyl acetate (PMSQ-VAc). The main functional groups of the two thickeners were characterized with IR spectroscopy. The viscosifying effect of the two thickeners in supercritical CO2 fracturing fluids and the rheological property of the fracturing fluids treated with the thickeners were measured with high pressure pipe flow experiment through long pipe. The filtration property and damaging capacity of supercritical CO2 fracturing fluids flowing through long natural cores with artificial fractures were also valuated. It was found in these studies that the thickening effect of the PMSQ thickener and the PMSQ-VAc thickener first increased and then decreased with temperature and pressure. As the concentration of the thickeners increased, the viscosity of the two CO2 fracturing fluids first increased and then decreased. Compared with PMSQ, PMSQ-VAc has better thickening effect in supercritical CO2 fluid; the viscosity of supercritical CO2 fluid can be increased by PMSQ-VAc to 3.892 mPa·s. In cores with permeability of 0.551 mD, supercritical CO2 mixed with PMSQ-VAc had a low filtration coefficient of 1.435×10-2 m/min1/2, a low filtration rate of 0.010 m/min and percent core damage of 16.33%-25.36%, which is weak.

     

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出版历程
  • 收稿日期:  2020-01-06
  • 刊出日期:  2020-04-28

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